Pen



FIG. 1 is a left front perspective view of a pen showing our new design;

FIG. 2 is a front elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a right side elevational view;

FIG. 5 is a rear elevational view;

FIG. 6 is a bottom plan view;

FIG. 7 is a top plan view of the cap member with the pen body removed for convenience of illustration; and,

FIG. 8 is a bottom plan view of FIG. 6. 

The ornamental design for a pen, as shown. 